Stève Stievenart, nicknamed "the Seal" ("le Phoque"), is a swimmer who specializes in extreme open-water swimming. His nickname comes from his build and his particular diet. To protect himself from the severe cold of the waters he faces, this resident of Wimereux (North of France) eats almost exclusively fatty fish, like seals [do]. https://podcasts.afp.com/afp-audio-sur-le-fil/202408112300-steve-le-phoque-lhomme-qui-dompte-les-mers-rediff

Triple Corona del Fin del Mundo (Triple Crown of the End of the World):

Cruce a Nado del Canal Beagle, 1.7 km between Chile and Uruguay in 53 minutes 24 seconds in 8°C water

Cruce a Nado del Estrecho de Magallanes, a 5 km crossing within Chilean waters in 1 hour 50 minutes 2 seconds on April 11th

Cruce a Nado del Río de la Plata, a 42 km crossing from Uruguay to Argentina in 17 hours 59 minutes 33 seconds on April 19th
https://dailynewsofopenwaterswimming.com/steve-stievenart-is-first-to-achieve-triple-corona-del-fin-del-mundo/

Short vertical video in French here: https://www.franceinfo.fr/sports/sport-et-loisirs/steve-stievenart-devient-le-premier-nageur-a-boucler-la-triple-couronne-du-bout-du-monde_7950017.html

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[–] oce@jlai.lu 4 points 2 days ago* (last edited 2 days ago)

Just not allowed by his organization. Competitive swimmers actually started to use wet suits at some point, but it was deemed too advantageous because it increased floatability and was eventually forbidden.